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CSC/FAR 020, Computer Graphics, September 12, 2012

CSC/FAR 020, Computer Graphics, September 12, 2012. Dr. Dale E. Parson http://faculty.kutztown.edu/parson Outline for week 3. Changing Canvas Size and Crop Tool. Retrieve CropLayerSelect.zip from Parsons -> Outbox and unzip on desktop. Browse using the Bridge.

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CSC/FAR 020, Computer Graphics, September 12, 2012

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  1. CSC/FAR 020, Computer Graphics, September 12, 2012 Dr. Dale E. Parson http://faculty.kutztown.edu/parson Outline for week 3

  2. Changing Canvas Sizeand Crop Tool • Retrieve CropLayerSelect.zip from Parsons -> Outbox and unzip on desktop. Browse using the Bridge. • Open NIME2009GeOcarina.jpg in Photoshop. • Image -> Canvas Size to shrink or grow the canvas. • Undo changes, try again. • Use Crop Marquee to crop the image. • Make sure Options Width, Height and Resolution are Clear. • Shield option highlights area to crop. • Crop area can be resized, moved, or rotated. • Use Enter or Control-click to accept, Escape to cancel. • Width and Height can set aspect ratio.

  3. Using Crop Tool to Copy Image Size • Save a smaller version of NIME2009GeOcarina.jpg as WxH.psd (5X7.psd) in inches. • With WxH.psd still open after saving, open Nime2009Trombon1.jpg from the Bridge. • In Crop Tool click Clear and Front Image from within 5X7.psd. Now crop Nime2009Trombon1.jpg, rotating marquee to get alignment. • Get both images to the same size. • Set background to black and enlarge the 5X7.psd to a size that can hold both images by stretching crop region. • Select -> All on the trombonist, paste and position into a layer.

  4. Regular Marquee Cropping • Select and area with the Marquee selector. • Optionally constrain size of Ratio. • Image -> Crop to crop from here. • Image -> Trim trims away fixed color margins. • Ruler Tool (grouped with Eyedropper) allows you to orient along some alignment feature. • Image -> Image Rotation -> Arbitrary rotates to this line.

  5. Layers • Merge the pair of layers in WxH.psd via the Layers command. • Sweep a marquee. • Create a new Layer via Copy from Layer menu. • Undo, try the same with Layer via Cut. • Convert background to a layer and back. • Layer groups are like Folders. They are useful for maintaining layers.

  6. Basic Selection • Open NVLakeFireFigure.jpg from Bridge. • Select -> All selects all pixels in layer. • Note other selection options. • Rectangular and Elliptical Selection tools: • Options on option bar, go into Refine Edge and explore. • Lasso Tools allows rough selection • Note new/add/subtract/intersect options. • Shift-sweep also adds to selection. • Alt/Option-sweep subtracts from selection.

  7. Polygonal and Magnetic Lasso • Draw straight-edge polygons around area, • Double-click anywhere or single-click start point to end. • Delete key cancels last vertex (last point clicked). • Alt/option sweeps reverts to free-form lasso. • Magnetic lasso assists using edge detection. • Delete and alt/option also work here. • Sometimes it closes its own areas based on boundaries. • Use zoom (command + and command -) with this.

  8. Selections Based on Color • Go to original NVLakeFireFigure.jpg . • Clear selections. • Use Quick-Selection tool to select the sky. • Auto-enhance to improve edge detection. • Change brush area to sample larger range of pixels. • Add sky and subtract clouds, etc. • Use magnetic lasso + and – for fine tuning. • Magic wand selects pixels using nearby colors. • Lower tolerance is more selective. • Control-click Similar to add non-adjacent regions.

  9. Silhouette • Create new image with black background. • Select All -> copy and paste a new layer. • Use color-based tools to Delete portions of image.

  10. Select -> Color Range • Selects based on pixel values with a range of fuzziness. NVLakeFireFigure.jpg: • Select the sky within some range of color values. • Vary Color Range and “Refine Edge” option parameters. • Select -> Inverse, then Marquee subtraction and Magic Wand subtraction to get the rock Figure only. • Edit -> Copy, Layer -> New from Copy. • Save As Dali.psd.

  11. Get rid of the pesky text. • Edit the new Layer that we just created. • Zoom in and use Magic Wand to select text. • Cut it to transparent background. • Use Select -> Color Range and Marquee Intersection to select & delete black smudges in the text borders. • Use Magic Wand to get a letter’s shape, slide the selection, copy some nearby pixels, then paste them back onto the letter. • Merge the two working layers and repeat, smudge. • Use Clone Stamp to tweak. Watch out for feathering!

  12. Adding layers • Add a series of layers from other photos. • Select all -> Copy -> Paste (across image files). • Drag a layer from one image to another • Use cloudy Kutztown sky to fill transparent sky layer. • Size layers using crop tool set to target image dimensions. • Stack additional, semi-transparent monochrome layers.

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